import  numpy as np
a1 = np.arange(24)
a1 = a1.reshape(4,6)
print(a1)
print('*'*100)
print(a1[1])
print(a1[1,:])
print(a1[1:2,:])
print(a1[[1,3],:])
print(a1[[1,2],[1,2]])
print(a1.T)
